de Latin adv. and prep. of separation in space, meaning "down from, off, away from," and figuratively "concerning, by reason of, according to;" from PIE demonstrative stem *de- (see to).

pression medical dictionary

1. The act of pressing; pressure.
2. <philosophy> An endeavor to move.
Origin: L. Pressio: cf. F. Pression.

depression late 14c. as a term in astronomy, from O.Fr. depression (14c.) or directly from L. depressionem (nom. depressio), noun of action from pp. stem of deprimere "to press down, depress" (see depress). Attested from 1650s in the literal sense; meaning "dejection, depression of spirits" is from early 15c. (as a clinical term in psychology, from 1905); meteorological sense is from 1881 (in reference to barometric pressure); meaning "a lowering or reduction in economic activity" was in use by 1826; given a specific application (with capital D-) by 1934 to the one that began worldwide in 1929. For "melancholy, depression" an O.E. word was grevoushede.